<template>
    <div class="list" ref='wrapper'>
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{ this.currentCity }}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" 
                        v-for="item of hot" 
                        :key='item.id'
                        @click=handleCityClick(item.name)
                        >
                        <div class="button">{{ item.name }}</div>
                    </div>
                </div>
            </div>
            <div 
            class="area" 
            v-for="(item, key) of cities" 
            :key='key'
            :ref='key'
            >
                <div class="title border-topbottom">{{ key }}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="innerItem of item" :key='innerItem.id'  @click=handleCityClick(innerItem.name)>{{ innerItem.name }}</div>                            
                </div> 
            </div>
        </div>    
    </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'

export default {   
    name:'CityList',
    props: {
        cities:Object,
        hot:Array,
        letter:String
    },
    methods: {
        handleCityClick(city) {
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    watch: {
        letter () {
            if(this.letter){
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    },
    computed: {
        ...mapState({
            currentCity: 'city'
        })
    },
    mounted () {
        this.scroll = new BScroll(this.$refs.wrapper)
    }
}
</script>

<style lang='stylus' scoped>
    @import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color #cccccc
        &:after
            border-color #ccc 
    .border-bottom
        &:before
            border-color #ccc
    .list 
        position absolute
        top 1.58rem
        left 0 
        right 0 
        bottom 0    
        overflow hidden    
        .title
            line-height .44rem
            background #eee
            color #666
            padding-left .2rem
            font-size .26rem
        .button-list
            padding .1rem .6rem .1rem .1rem
            overflow hidden
            .button-wrapper
                width 33.33%
                float left
                .button
                    margin .1rem
                    text-align center
                    border .02rem solid #ccc
                    padding .1rem 0
                    border-radius .06rem
        .item-list
            .item
                line-height .76rem
                padding-left .06rem
</style>
